docs: def messageid_match(self, messageid):
          """Add match for log entries with specified `messageid`.
  
          `messageid` can be string of hexadicimal digits or a UUID
          instance. Standard message IDs can be found in systemd.id128.
  
          Equivalent to add_match(MESSAGE_ID=`messageid`).
          """
          if isinstance(messageid, _uuid.UUID):
              messageid = messageid.hex
          self.add_match(MESSAGE_ID=messageid)